I noticed that the imap extension seems to support only IMAP2 search criteria.

This is caused by the fact that in ext/imap/php_imap.c, the imap_search 
function uses a call to mail_criteria. And
the University of Washington IMAP toolkit mentions in docs/internal.txt:

SEARCHPGM *mail_criteria (char *criteria);
        criteria IMAP2-format search criteria string

     This function accepts an IMAP2-format search criteria string and
parses it.  If the parse is successful, it returns a search program
suitable for use in mail_search_full().
        WARNING: This function does not accept IMAP4 search criteria.

Is there any specific reason why PHP uses this mail_criteria call ? It really 
would be nice to be able to use IMAP4 search criteria !


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